The LOGISTIC Procedure

specifies the significance level for % confidence intervals. By default, the value of number is equal to the ALPHA= option in the PROC LOGISTIC statement, or 0.05 if that option is not specified. This option has no effect unless the CLM option in the SCORE statement is requested.

outputs the Wald-test-based confidence limits for the predicted probabilities. This option is not available when the INMODEL= data set is created with the NOCOV option.

outputs the cumulative predicted probabilities , to the OUT= data set. This option is valid only when you have more than two response levels; otherwise, the option is ignored and a note is printed in the SAS log. These probabilities are named CP_level_i, where level_i is the ith response level.

If the CLM option is also specified in the SCORE statement, then the Wald-based confidence limits for the cumulative predicted probabilities are also output. The confidence limits are named CLCL_level_i and CUCL_level_i. In particular, for the lowest response level, the cumulative values (CP, CLCL, CUCL) should be identical to the individual values (P, LCL, UCL), and for the highest response level CP=CLCL=CUCL=1.

specifies a value between 0 and 1 for which observations that have a larger predicted probability are classified as events and observations that have a smaller predicted probability are classified as nonevents. This value is used in computing the error rate for binary response models when you also specify the FITSTAT option. The CUTPOINT= option is ignored for polytomous response models. By default, CUTPOINT=0.5.

names the SAS data set that you want to score. If you omit the DATA= option in the SCORE statement, then scoring is performed on the DATA= input data set in the PROC LOGISTIC statement, if specified; otherwise, the DATA=_LAST_ data set is used.

It is not necessary for the DATA= data set in the SCORE statement to contain the response variable unless you are specifying the FITSTAT or OUTROC= option.

Only those variables involved in the fitted model effects are required in the DATA= data set in the SCORE statement. For example, the following statements use forward selection to select effects:

proc logistic data=Neuralgia outmodel=sasuser.Model;
   class Treatment Sex;
   model Pain(event='Yes')= Treatment|Sex Age
         / selection=forward sle=.01;
run;

Suppose that Treatment and Age are the effects selected for the final model. You can score a data set that does not contain the variable Sex because the effect Sex is not in the model that the scoring is based on. For example, the following statements score the Neuralgia data set after dropping the Sex variable:

proc logistic inmodel=sasuser.Model;
   score data=Neuralgia(drop=Sex);
run;

displays fit statistics for the data set you are scoring. The data set must contain the response variable. For more information, see the section Fit Statistics for Scored Data Sets.

names the SAS data set that contains the predicted information. If you omit the OUT= option, the output data set is created and given a default name by using the DATAn convention.

names the SAS data set that contains the ROC curve for the DATA= data set. The ROC curve is computed only for binary response data. See the section OUTROC= Output Data Set for the list of variables in this data set.

names the SAS data set that contains the priors of the response categories. The priors can be values proportional to the prior probabilities; thus, they do not necessarily sum to one. This data set should include a variable named _PRIOR_ that contains the prior probabilities. For events/trials MODEL statement syntax, this data set should also include an _OUTCOME_ variable that contains the values EVENT and NONEVENT; for single-trial syntax, this data set should include the response variable that contains the unformatted response categories. See Example 79.16 for an example.

specifies the prior event probability for a binary response model. The PRIOREVENT=SCOREDATA option uses the proportion of events in the data set that you specify in the DATA= option of the SCORE statement. If you specify both the PRIOR= and PRIOREVENT= options, the PRIOR= option takes precedence.

specifies the criterion for grouping estimated event probabilities that are close to each other for the ROC curve. In each group, the difference between the largest and the smallest estimated event probability does not exceed the given value. The value must be between 0 and 1; the default value is the ROCOPTIONS(EPS=) value. If you omit that option, then the default is the MODEL ROCEPS= value; and if you omit that option, then the default is the square root of the machine epsilon, which is about 1E–8. The smallest estimated probability in each group serves as a cutpoint for predicting an event response. The ROCEPS= option has no effect if you omit the OUTROC= option in the SCORE statement.